diff --git a/src/filters.rs b/src/filters.rs
index 65e36d6..c565fcb 100644
--- a/src/filters.rs
+++ b/src/filters.rs
@@ -124,6 +124,14 @@ where
     fs::metadata(path).await.map(fun).unwrap_or(false)
 }
 
+filter! {
+    "not";
+    struct Not { filter: Box<dyn Filter>, };
+    (self, path) -> {
+        !self.filter.matches(path).await
+    }
+}
+
 filter! {
     "any";
     struct Any { filters: Box<[Box<dyn Filter>]>, };